Keyboard



FIG. 1 is a perspective view of a keyboard in accordance with the present design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a partial perspective view of the keyboard in accordance with the present design. 

The ornamental design for a keyboard, substantially as shown and described. 